Water is boiled under a pressure of `1.0 atm`. When an electric current of `0.50A` from a `12V` supply is passed for `300`s through a resistance in thermal contact with it, it is found that `0.789 g` of water is vaporied. Calculate the molar internal enegry and enthalpy chnages at boiling point `(373.15K)`.

0.15 molal solution of a substance boils at 373.23 K. Calculate molal elevation constant of water, (Given boiling point of water=373.15K)

When a resistance of 12 Omega is connected with a cell of emf 1.5 V, 0.1A current flows through the resistance. Internal resistance of the cell is—

When a resistance of 12 Omega is conencted with a cell of emf 1.5 V,0.1 A current flows through the resistance internal resistance of the cell is

18g of glucose is dissolved in 1kg of water in a container. At what temperature the solution will boil? ( K_b for water = 0.52, boiling point of water = 373.15K)

A new flourocarbon of molar mass 102 g mol^(-1) was placed in an electricity heated vessel. Whwn the pressure was 650 torr, the liquid boiled at 77^(@) C. After the boiling point had been reached , it was found that a current of 0.25 A from a 12.0 volt supply passed for 600 sec vaporises 1.8g of the sample. The molar enthalpy and enternal energy of vaporisation of new flourocarbon will be :

A new flourocarbon of molar mass 102 g mol^(-1) was placed in an electricity heated vessel. Whwn the pressure was 650 torr, the liquid boiled at 77^(@) C. After the boiling point had been reached , it was found that a current of 0.25 A from a 12.0 volt supply passed for 600 sec vaporises 1.8g of the sample. The molar enthalpy and enternal energy of vaporisation of new flourocarbon will be :

A solution of 12.5 g urea in 170 g of water gave a boiling point elevation of 0.63 K. Calculate the molar mass of urea, taking K_b=0.52 K/m.